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import {
type AttributeNode,
type DirectiveNode,
type ExpressionNode,
NodeTypes,
type SimpleExpressionNode,
} from '../ast'
import {
CompilerDeprecationTypes,
isCompatEnabled,
warnDeprecation,
} from './compatConfig'
import type { NodeTransform, TransformContext } from '../transform'
import { toValidAssetId } from '../utils'
const validDivisionCharRE = /[\w).+\-_$\]]/
export const transformFilter: NodeTransform = (node, context) => {
if (!isCompatEnabled(CompilerDeprecationTypes.COMPILER_FILTERS, context)) {
return
}
if (node.type === NodeTypes.INTERPOLATION) {
// filter rewrite is applied before expression transform so only
// simple expressions are possible at this stage
rewriteFilter(node.content, context)
} else if (node.type === NodeTypes.ELEMENT) {
node.props.forEach((prop: AttributeNode | DirectiveNode) => {
if (
prop.type === NodeTypes.DIRECTIVE &&
prop.name !== 'for' &&
prop.exp
) {
rewriteFilter(prop.exp, context)
}
})
}
}
function rewriteFilter(node: ExpressionNode, context: TransformContext) {
if (node.type === NodeTypes.SIMPLE_EXPRESSION) {
parseFilter(node, context)
} else {
for (let i = 0; i < node.children.length; i++) {
const child = node.children[i]
if (typeof child !== 'object') continue
if (child.type === NodeTypes.SIMPLE_EXPRESSION) {
parseFilter(child, context)
} else if (child.type === NodeTypes.COMPOUND_EXPRESSION) {
rewriteFilter(node, context)
} else if (child.type === NodeTypes.INTERPOLATION) {
rewriteFilter(child.content, context)
}
}
}
}
function parseFilter(node: SimpleExpressionNode, context: TransformContext) {
const exp = node.content
let inSingle = false
let inDouble = false
let inTemplateString = false
let inRegex = false
let curly = 0
let square = 0
let paren = 0
let lastFilterIndex = 0
let c,
prev,
i: number,
expression,
filters: string[] = []
for (i = 0; i < exp.length; i++) {
prev = c
c = exp.charCodeAt(i)
if (inSingle) {
if (c === 0x27 && prev !== 0x5c) inSingle = false
} else if (inDouble) {
if (c === 0x22 && prev !== 0x5c) inDouble = false
} else if (inTemplateString) {
if (c === 0x60 && prev !== 0x5c) inTemplateString = false
} else if (inRegex) {
if (c === 0x2f && prev !== 0x5c) inRegex = false
} else if (
c === 0x7c && // pipe
exp.charCodeAt(i + 1) !== 0x7c &&
exp.charCodeAt(i - 1) !== 0x7c &&
!curly &&
!square &&
!paren
) {
if (expression === undefined) {
// first filter, end of expression
lastFilterIndex = i + 1
expression = exp.slice(0, i).trim()
} else {
pushFilter()
}
} else {
switch (c) {
case 0x22:
inDouble = true
break // "
case 0x27:
inSingle = true
break // '
case 0x60:
inTemplateString = true
break // `
case 0x28:
paren++
break // (
case 0x29:
paren--
break // )
case 0x5b:
square++
break // [
case 0x5d:
square--
break // ]
case 0x7b:
curly++
break // {
case 0x7d:
curly--
break // }
}
if (c === 0x2f) {
// /
let j = i - 1
let p
// find first non-whitespace prev char
for (; j >= 0; j--) {
p = exp.charAt(j)
if (p !== ' ') break
}
if (!p || !validDivisionCharRE.test(p)) {
inRegex = true
}
}
}
}
if (expression === undefined) {
expression = exp.slice(0, i).trim()
} else if (lastFilterIndex !== 0) {
pushFilter()
}
function pushFilter() {
filters.push(exp.slice(lastFilterIndex, i).trim())
lastFilterIndex = i + 1
}
if (filters.length) {
__DEV__ &&
warnDeprecation(
CompilerDeprecationTypes.COMPILER_FILTERS,
context,
node.loc,
)
for (i = 0; i < filters.length; i++) {
expression = wrapFilter(expression, filters[i], context)
}
node.content = expression
// reset ast since the content is replaced
node.ast = undefined
}
}
function wrapFilter(
exp: string,
filter: string,
context: TransformContext,
): string {
context.helper(RESOLVE_FILTER)
const i = filter.indexOf('(')
if (i < 0) {
context.filters!.add(filter)
return `${toValidAssetId(filter, 'filter')}(${exp})`
} else {
const name = filter.slice(0, i)
const args = filter.slice(i + 1)
context.filters!.add(name)
return `${toValidAssetId(name, 'filter')}(${exp}${
args !== ')' ? ',' + args : args
}`
}
}
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